车架的结构型式有多种,常用的()。
A.钢管式、钢板式、管板式
B.钢管式、边梁式、管板式
C.钢板式、中梁式、钢管式
D.管板式、边梁式、钢板式
参考答案:A
We are always told that only through hard work our goals in our study.
A.we will achieve
B.we have achieved
C.have we achieved
D.will we achieve
试述乙脑的诊断。