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【单选题】
()宜用于盲孔或拆卸困难的场合。A.
圆柱销
B.
圆锥销
C.
带有外螺纹的圆锥销
D.
开尾圆锥销
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举一反三
【单选题】The roar of the crowd combined with the speaker’s own low-decibel (分贝) delivery ensured that few could hear anything he said.
A.
a shocking noise like thunder
B.
a very loud and forceful voice
C.
a sudden loud noise by sth. breaking
【简答题】The crowd's roar turned to ________ when Willy emerged from the dressing-room.
参考解析：
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