后张法预应力筋张拉后，孔道应尽快灌浆，其水泥砂浆强度应不低于_爱下问搜题

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问题单项选择题

后张法预应力筋张拉后，孔道应尽快灌浆，其水泥砂浆强度应不低于（） N/mm²。

A．30

B．25

C．20

D．10

答案

参考答案：C

选择题

－Hi, Bruce. Here’s a letter for you.

－Thanks. I wonder_________.

A．who that letter was from

B．who was from that letter

C．who was that letter from

D．who from that letter was

单项选择题

营业网点收缴假币必须（）人在场。

A、1

B、2

C、3

D、4