题目内容

Laptops are now so expensive______________beyond the reach of almost everyone.

A. that be
B. as to be
C. as be
D. as being

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隔离开关触指应排列整齐，弹簧勾应处在弹簧勾凸痕处

A. 正确
B. 错误

气腿式凿岩机工作中发生的断钎现象主要是（）造成的。

A. 钎杆受力不合理
B. 钎杆局部弯曲
C. 钎杆端头受冲击，产生疲劳断裂

He must have heard of the bad news,______________can be perceived in his expression.

A. as
B. what
C. while
D. that

辙叉趾、辙叉跟轨头及下颏部位裂纹长度超过（）时，应及时更换。

A. 10mm
B. 20mm
C. 30mm
D. 40mm