根据JB4708—92《钢制压力容器焊接工艺评定》的规定,板材角焊缝试样进行宏观金相检验时,应沿试件横向等分切取()试样。
A.3个
B.4个
C.5个
D.6个
参考答案:C
上个三角形三条边都是3厘米,它的上个角是______度,这个三角形既是______三角形,又是______三角形.
China Daily is ____ a newspaper, it can also help us to improve our English. [ ]
A. less than
B. more than
C. not more than
D. no more than