根据《建筑施工工具式脚手架安全技术规范》,当室外温度大于或等于()℃时,宜采用Q235钢和Q345钢。
A.-5
B.-10
C.-15
D.-20
参考答案:D
被称为“绒毛心”炎症是心外膜的()(P281-18)
A、化脓性炎
B、出血性炎
C、浆液性炎
D、卡他性炎
E、纤维素性炎
—Will there be robots in people's homes?
—____________.
A. Yes, there will
B. Yes, there be
C. No, there will
D. No, it won't