关于坐骨棘间径哪项是正确的A．9.6cm B．≥10cm C．≤10cm D．9.8_爱下问搜题

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问题单项选择题

关于坐骨棘间径哪项是正确的

A．9.6cm

B．≥10cm

C．≤10cm

D．9.8cm

E．10cm

答案

参考答案：B

填空题

用所给词的正确形式填空。

play, thank, write, not like, good, homework, swim, get, bird, one

1. Tom often _______ letters to his pen pal.
2. There are some _______ in the tree.
3. I have some ________ to do on weekends.
4. Look! They ________basketball over there.
5. _______ for your help.
6. Sunday is the _______ day of a week.
7. It's time for us _______ up.
8. Let's _______ in the river.
9. Han Mei _______ documentaries because they are boring.
10. Lily's brother plays computer games very _______.

问答题简答题

计算题：如图D－12（a），拉杆BC由40mm×40mm×4mm的等边角钢制成，角钢的许用应力[δ]=160MPa，当起重P=20kN时，试校核杆BC的强度。