太阳辐射的可见光,其波长范围是()微米。
A.0.28~3.0
B.0.38~0.76
C.0.5~1.0
D.0.5~2.0
参考答案:B
.
---David. I’ve lost my keys again.
---Here, not again!You______ your keys.
A.always lost
B.always lose
C.are always losing
D.had been losing
一般认为在服毒后,多长时间内洗胃最佳()。
A.0~1h
B.1~3h
C.4~6h
D.6~12h
E.12~24h