试验表明,当密集气孔使断面减小低于()%时,抗拉强度不会降低,但是在疲劳载荷作用下会引起应力集中,而产生疲劳裂纹。
A.7
B.10
C.12
D.15
参考答案:A
安全班长对本班各岗位工作负责,对服务礼仪、()()()物品摆放、质量记录、装备佩带、操作规程等检查;并在《安全员值班工作交接记录表》中“检查记录”栏记录。
A.精神面貌
B.考勤纪律
C.岗位卫生
D.手机佩带
— Didn't bob get ready for his English speech?
— No, he didn't. During his speech, he was very _____.[ ]
A. excited
B. womed
C. nervous
D. confident