采用双机抬吊作业时，每台起重机荷载不得超过允许荷载的( )，且应对每一吊进行试吊作业，施工中必须保持两台起重机同步作业。
A. 60%
B. 70%
C. 80%
D. 90%
查看答案
It can be inferred from the passage that ______.
A. clear water on earth is unlimited.
B. fossil fuels and nuclear energy are more important than falling water from dammed-up rivers
C. part of the water used by a person or a community may eventually be used by others
D. most of the earth's hydroelectric potential has been exploited
If the author of the passage wished to study a new field, he would probably______.
A. call in a dictionary expert
B. become easily discouraged
C. look to the histories of the words in the new field
D. pay careful attention to the new field's technical vocabulary
共用题干题男性，28岁，半年前左侧头部外伤，当时神清，左颞部头皮裂伤，经清创缝合术并用抗生素治疗，但术后伤口化脓，虽取出粉碎骨片，感染伤口一直流脓不愈至今，近1周嗜睡，感头痛不适，呕吐 查体：血压18/11kPa（135/83mmHg），脉搏50次/分，呼吸18次/分，多呈嗜睡状态，语音有时含糊，吐词不清，对亲人不认识，命名性失语，颅神经系统无异常发现，四肢活动正常，血象正常。在病史及检查方面，最少联想到应用利尿脱水剂的是：（）
A. 血压18/1lkPa，脉搏50次/分
B. 命名性失语
C. 头痛、呕吐
D. 嗜睡状态
E. 血象正常
Which of the following can help children have the experiences dealing with the floatability of liquids
A. observing the chemicals that dissolve in water.
B. watching water evaporate.
C. investigating how objects sink or float in water.
D. observing how candle wax changes its state.
微信支付 
支付宝支付