点荷法检测砌筑砂浆强度时，测试用的压力试验机，最小读数盘宜为（）以内。
A.50kN
B.60kN
C.80kN
D.100kN
参考答案：A
He demanded ___ here in time.
A．us to get
B．that we arrived
C．we arrive
D．that we had reached
简述实施综合实践活动应遵循的原则
