检查口中心距地面为（） A.0.8m B.1.5m C.1.2m D.1.0m

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问题单项选择题

检查口中心距地面为（）

A.0.8m

B.1.5m

C.1.2m

D.1.0m

答案

参考答案：D

单项选择题

A swap is best characterized as a()

A. series of forward contracts.

B. derivative contract that has not gained widespread popularity.

C. contract that is binding on only one of the parties to the transaction.

单项选择题

在Windows 中，如果使用键盘操作，缺省情况下按（30）键进行输入法切换。

A．Ctrl+Space

B．Ctrl+Alt

C．Ctrl+Shift

D．Ctrl+Alt+Delete