牌号为YT30的硬质舌金材料比牌号为YT5的硬质合金的()低。
A.抗弯强度
B.韧性
C.硬度
D.疲劳强度
参考答案:A
屋面防水工程等有防水、防渗透要求的,其保修期为( )。
A.2年 B.3年 C.1年 D.5年
— Jim, how did your English test go?
— I had thought I ________, but luckily I came top in the list in class.
A.should have failed
B.could have failed
C.need have failed
D.might have failed