题目内容

博山纹石产于山东博山,跟泰山石,大化石相类似。()
参考答案:错误

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What was the possible reason for the shuttle disaster?

A. Columbia could not survive reentry.
B. A block of foam damaged a wing.
C. The aircraft disintegrated in the sky.
D. The external tank was made of reinforced carbon.

【C10】

As
B. Which
C. That
D. Who

【C14】

A. participants
B. candidates
C. rivals
D. victims

SDH相对于PDH的特点是()
A开销低
BSTM-4以上国际标准统一
CSDH比PDH频带利用率高
D可以进行最佳路由选择

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