工人每天接触4h的生产性噪声岗位的噪声容许强度为()
A.≤90dB
B.≤90dBA.
C.≤88dBA.
D.≤93dB
E.≤93dBA.
参考答案:C
–Jane called to say that she couldn’t come to your birthday party this Saturday night.
–______ David has been expecting to see her for ages.
A.What a shame!
B.How could she do that?
C.That’s terrible!
D.I don’t care.
计算:(﹣1)2006+(﹣1)2007=( ).