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问题 多项选择题

低应变检测时，受检桩应符合下列规定（）。

A、达到设计强度的70%

B、强度不小于15MPa

C、桩顶面与桩轴线基本垂直

D、桩顶面与桩轴线完全垂直

答案

参考答案：A, B, C

改错题

改错

1. To she surprise, this phone call changed her life.          (      )

          A        B                                 C       D

2. Parents should not be too strict in teenagers.                (      )

       A                        B  C           D

3. I can't think of any good advices to give her.                ( )

                   A      B                C                 D

4. I haven't seen my cat for two days. I'm very worry about her.           ( )

                 A                  B                                  C               D

                                                                                                             ( )

5. You would rather stay at home and read a book than to go to a party.

                  A                   B                                      C             D

                                                                                                                            ( )

                                   
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选择题
如图表示一交流电的电流随时间而变化的图象，此交变电流的有效值是（　　）

A．5A

B．5A

C．3.5A

D．3.5A
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