抹灰工程应对水泥的（）进行复验。
A、凝结时间
B、安定性
C、强度
参考答案：A, B
I walked slowly through the market, where people all kinds of fruits and vegetables. I studied the prices carefully and bought what I needed.
A．sell
B．were selling
C．had sold
D．have sold
平地机在作业中，根据铲土阻力大小，随时少量调整刮刀切土深度，但刮刀升降量差，不得过大。（）
