在使用吊环前，应检查螺丝杆部位是否有损伤及弯曲变形现象。
参考答案：对
. Jenny hopes that Mr. Smith will suggest a good way to have her written English __________ in a short period.
A．improved
B．improving
C．to improve
D．improve
扩张动脉而治疗心衰的药物是
A．呋塞咪B．肼屈嗪C．普萘洛尔D．卡托普利E．硝普钠
