题目内容
（请给出正确答案）
A.the mass of the substances added to the graduated cylinder.
B.the density of the graduated cylinder.
C.when the total volume of the added substances was equal to 50.0 mL.
D.when all of the KI was dissolved in the H2O.
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更多“In Experiments 1 and 2, the students tared the graduated cylinder in each trial so they co”相关的问题
A.Trials 1 and 2
B.Trials 2 and 3
C.Trials 2 and 4
D.Trials 3 and 5
Palese s experiments with the guinea pigs______.
A．fully support Theory 3
B．partly confirm Theory 2
C．raise doubt on Theory 1
D．find little evidence for all theories
The data collected from Experiments 1 and 2 show:
A.no clear trend in sulfate concentration among terrestrial deposits, but increasing sulfate concentrations in the lakes.
B.increasing sulfate concentration among terrestrial deposits, but decreasing sulfate concentrations in the lakes.
C.no clear trend in sulfate-concentration levels either among terrestrial deposits or among the lakes.
D.increasing sulfate concentrations among terrestrial deposits, but no clear trend in sulfate-concentration levels in the lakes.
The phrase "stumbled upon" (Line 1, Para. 1) is closest in meaning to" ______".
A．discovered after great efforts
B．found out quite by chance
C．amazed and confused by
D．invented in experiments
A.Cooled the solution to its freezing point
B.Heated the solution to its boiling point
C.Detected the concentration of nitrazine yellow in the solution
D.Passed an electrical current through a portion of the solution
A.less than 500 torr.
B.between 500 torr and 1,000 torr.
C.between 1,000 torr and 1,500 torr.
D.greater than 1,500 torr.
A.Yes; in Experiment 1, as capacitance increased, the time required to reach a given voltage increased.
B.Yes; in Experiment 2, as capacitance increased, the time required to reach a given voltage increased.
C.No; in Experiment 1, as capacitance increased, the time required to reach a given voltage decreased.
D.No; in Experiment 2, as capacitance increased, the time required to reach a given voltage decreased.
Below is part of the abstract of a research article. Which sentence identifies the problem with previous studies？ (1) In widgetology, it's long been understood that you have to glomp the widgets before you can squiffle them. (2) However, there is still no known general method to determine when they’ve been sufficiently glomped. (3) This paper introduces a new glomping technique, called googa-glomping, which allows direct measurement of whifflization, a superior metric for assessing squiffle-readiness. (4) We describe a series of experiments on each of the five major types of widget, and show that in each case, googa-glomping runs faster than competing techniques, and produces glomped widgets that are perfect for squiffling.
A、Sentence 1
B、Sentence 2
C、Sentence 3
D、Sentence 4
A.The frequency response varied more widely when filter type 3 was used than when either Filter type 1 or Filter type 2 was used.
B.Filter type 3 contains a ground and was therefore the safest of the three types of filters to experiment with.
C.Filter type 3 is the only one among the three that contains an inductor.
D.Input voltage could be more easily regulated using a type 3 filter than using either a type 1 or type 2 filter.
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