A:come about
B:taken place
C:broken out
D:happened
39+44-27=____ 90-36-25=____ 26+34+19=____
—Can a plane fly__________ the Atlantic Ocean?
—Yes, but it needs to go_______ the clouds for hours.
学生用电压表有____ 个接线柱,____个量程,当被测电路的电源是三节蓄电池时,应选用的电压表量程为____
下列句子中,没有语病的一项是( )