一铸铁悬臂梁，其几何尺寸和荷载见图所示，已知材料的许用拉应力[σt]=30MPa，许用压应力[σc]=70MPa，则该梁能承受的许可荷载[P]为()
A. 15.94kN
B. 61.98kN
C. 74.38kN
D. 53.13kN
查看答案
Breaches in confidentiality are common in medical circles all over the world.
A. Right
B. Wrong
C. Not mentioned
使用未经鉴定合格的包装容器的危险货物，不准出口。()
A. 正确
B. 错误
Which of the following does not fit with sleep hygiene？
A. Making a rule to go to bed at a specific time every day.
B. Going to bed when sleepy, not always at the same time.
C. Trying not to drink any caffeine and alcohol in the evening.
D. Changing bad sleep habits and following doctors' advice.
对没有染疫的船舶、航空器，如果来自霍乱疫区，检验检疫机构认为必要时，可以对离船、离航空器的员工、旅客，从离开疫区时算起，实施不超过五日的隔离观察。()
A. 正确
B. 错误
微信支付 
支付宝支付