GB/T8017蒸气压测定时，应预先做好（）。
A.汽油室的准备
B.空气室的准备
C.取样
D.容器中试样的空气饱和
参考答案：A, B, C, D
—Are these his cousins?
—_______. They are his brothers.[ ]
A. Yes, they are.
B. No, these aren’t.
C. Yes, these are.
D. No, they aren’t.
玻璃幕墙设计中防止玻璃破碎坠落伤人的措施。
