两根等高避雷针的保护范围,一般情况下两针间距与针高之比D/h不宜大于( )
A.5
B.6
C.8
D.10
参考答案:A
—Do you mind ________ here?
—________.
A. me to smoke; Not at all
B. my smoking; Not at all.
C. my to smoke; Of course not
D. if I smoke; Yes, I don't
将质量相等的实心铅球、铜球和铁球,分别浸没在三个大小、形状相同的水杯里后,再将三水杯装满水,且无溢出,以下判断中正确的是(已知ρ铅>ρ铜>ρ铁): [ ]
A.放铅球的水杯盛水较多
B.放铜球的水杯盛水较多
C.放铁球的水杯盛水较多
D.三个水杯盛的水一样多