如果采用称重法检定气体流量计，在一定的容积V下，容器的质量m与充气的质量mg相差越大，则检定结果越准确。
参考答案：错
-It's difficult for the village children to cross the river for school.
- I think a bridge _________ over the river. [ ]
A. was built
B. is being built
C. should be built
D. has been built
有关扁桃体，以下哪项是错误的（）。
A.扁桃体是淋巴内环中最大的淋巴组织
B.扁桃体位于呼吸和消化道的门户
C.扁桃体只有体液免疫作用
D.成年后扁桃体逐渐萎缩变小
E.扁桃体上隐窝最大、最深
