下面对Q235-A钢容器说法正确的是()。
A、可盛装液化石油气体
B、硅含量多
C、可直接受火焰加热
D、钢板厚度大于16mm
参考答案:B
要得到4.5V的电压,可以将______节新干电池______联起来.
_____ have you been swimming? For five years.
A.How many times
B.How long
C.How often
D.How much