对应当实施卫生检疫的邮包，未经卫生检疫机关许可，邮政部门不得运递。()
查看答案
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
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.
微信支付 
支付宝支付