embryonic disc

A．are, are

B．is, is

C．are, is

D．is, are

A、合子期(zygotic)

B、胚芽期(germinal)

C、胚胎期(embryonic)

D、胎儿期(fetal)

The main topic of the passage is______

A．the early development of embryos of lower marine organisms

B．the main contribution of modern embryology to molecular biology

C．the role of molecular biology in disproving older theories of embryonic development

D．cell determination as an issue in the study of embryonic development

E．scientific dogma as a factor in the recent debate over the value of molecular biology

The moral shortsightedness is revealed in the fact that _____.

［A］ the government has stopped the experiment on human tissue

［B］ the donation consent forms are difficult to understand

［C］ the Human Tissues Act is an obstacle to important medical research

［D］ embryonic research shows disregard for human life

A.胚芽期(germinal)

B.胚胎期(embryonic)

C.胎儿期(fetal)

D.合子期(zygotic)

Aother name for the “swash plate” in the variable delivery pump is

A.tiltable disc

B.gravity disc

C.distributing disc

D.catch plate

The ______is not a component of an oil separator.

A.sliding bowl bottom

B.gravity disc

C.separating disc

D.scum valve

A.water

B.oil

C.scale

D.ridge