荧光灯逆变器是将()电转化为交流电,从而点燃()。
参考答案:直流电;荧光灯
如图所示是用温度计测量液体温度的示意图,其中温度计使用正确的是( )
A.
B.
C.
D.
From time to time a crocodile has snatched someone _______ he or she is even aware that the crocodile is there.
A.when
B.until
C.since
D.before