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问题 单项选择题

作为盖梁模板的支护系统，其立杆底部应有通长的槽钢或厚度不小于( )mm的木板且上设有100mm×100mm钢板座垫衬。

A．40

B．50

C．60

D．70

答案

参考答案：B

单项选择题

痛痹的临床特征是

A．关节痛，游走不定

B．关节疼痛，红肿灼热

C．疼痛剧烈，痛有定处

D．痛重者，肌肤不仁

E．屈伸不利，心悸气短
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单项选择题

The long-run production decision differs from the short-run production decision in that:()

A. variable costs can be changed in the short run but not the long run.

B. fixed costs can be changed in the short run but not the long run.

C. fixed costs can be changed in the long run but not the short run.
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