在浇筑大深度混凝土时,为防止在钢筋底面出现沉淀收缩和泌水,形成疏松空隙层,削弱粘结,对高度较大的混凝土构件应分层浇筑或二次浇捣。
参考答案:对
所属各单位在授权范围内订立的合同,由谁在合同文本上签字?
根据情景选择合适的句子。
1. 你到水果店里去买水果,想知道有没有香蕉,可以问:[ ]
A. How much are they?
B. Do you have any bananas?
2. 想知道梨卖多少钱,可以说:[ ]
A. Two yuan.
B. How much are the pears?
3. 觉得西瓜的价钱有点贵,可以说: [ ]
A. That's expensive.
B. I'll take two, please.
4. 想知道这些铅笔是在廉价出售的吗,可以问:[ ]
A. How much is this?
B. Are the pencils on sale?