选择题:At least 76 people died when a Sibir Airlines Tu-1

题目内容:
At least 76 people died when a Sibir Airlines Tu-154 ________ into the sea about 180 kilometers from the Russian resort of Sochi on Thursday. (分数:1 分)
A. dropped
B. jumped
C. plunged
D. declined
参考答案:

使用焊枪示教前,检直焊枪的均压装置是否好动作是否正常同时对电极头的要求是( )。

使用焊枪示教前,检直焊枪的均压装置是否好动作是否正常同时对电极头的要求是( )。

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