在TCP/IP网络中,测试连通性的常用命令是()。
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Laptops are now so expensive______________beyond the reach of almost everyone.
A. that be
B. as to be
C. as be
D. as being
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