A.onB.inC.to
A.on
B.in
C.to
A.on
B.in
C.to
Write the telephone number down()you forget.
A.on case
B. in case
C. under case
He didn't pass the exam ______ that he hadn't studied hard.
A.on
B.×
C.in
D.up to
A.A.on average
B.B. at last
C.C.in common
D.D. at present
A.ON/OFF:为关闭或接通电源
B.入/Select:光功率计校准波长选择,如需改变波长,按键一次则显示另一个设臵波长,设臵波长可往复顺序循环。
C.W/dBm:光功率计单位选择,按键后在nW和dBm之间转换。
D.Ref:按该键则将测量值转换成以dB为单位的相对差值。
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