维持机体新陈代谢所必需的能量,为小儿所特有的是()
A.基础代谢
B.生长发育所需
C.食物特殊动力作用
D.活动所需
E.排泄损失能量
参考答案:B
Fisherman Wang Bingzhong from Changli county,Herbei province,examines his boat on May 25 after it was damaged in ________he described as a pirate attack.
A.which
B.that
C.what
D.where
A级和B级主机房的含尘浓度,在静态条件下测试,每升空气中大于或等于0.5μm的尘粒数应少于()?
A.18000粒
B.16000粒
C.14000粒
D.28000粒