【名词&注释】
无线电台(radio station)、手提式(portable)、总重量(total weight)
[单选题]手提式电台是一种手摇供电的无线电台，能自15米高处投入水中不致损坏且能浮于水面，总重量不超过：
A. 13公斤
B. 23公斤
C. 25公斤
查看答案&解析
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举一反三：
[单选题]鲨鱼能很远距离感觉到人的汗血腥气味是何种器官：
A. 嗅觉
B. 视觉
C. 听觉
D. 都是
[单选题]Piston cooling fins are located
A. atop the piston crown
B. beneath the piston crown
C. at the base of the piston skirt
D. inside the cylinder liner cooling water jacket
[单选题]To prevent excessive __ in the transverse girders, the tie bolts are positioned as close to the center of the crankshaft as possible
A. thermal stresses
B. bending moments
C. thermal loads
D. surface tensions
[单选题]According to the passage, we can infer that the pole piece diameter must be tooth height.
A. as same as
B. much less than
C. much more than
D. not confirmed
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