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问题 单项选择题

按照桥梁划分类型标准，斜拉桥属于（）。

A.拱式桥

B.组合体系桥

C.梁式桥

D.刚架桥

答案

参考答案：B

单项选择题

You had 8 people In your project，one more person will be joining next week．You know that once the new person joins，the number of communication channels will increase by______．

A．No change in number of communication channels

B．8

C．12

D．20
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单项选择题

淋球菌培养箱内C02的浓度为()

A．2%～5%

B．5%～10%

C．10%～15%

D．15%～20%
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