煤中全硫含量的测定中,空气干燥煤样质量为()
A、1g
B、0.5g
C、0.05g
D、1.5g
参考答案:C
It is not a good idea to skip meals and __________ them with ice creams.
A.remove
B.replace
C.return
D.renew
切换式换热器的冷端温差的控制值与什么因素有关?