皮皮学，免费搜题
登录
搜题
【多选题】
对毒作用带描述正确的是A.
半数致死剂量与急性阈剂量的比值为急性毒作用带
B.
急性阈剂量与慢性阈剂量的比值为慢性毒作用带
C.
急性毒作用带值大，引起死亡的危险性大
D.
慢性毒作用带值大，发生慢性中毒的危险性大
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】He _______ his chair backwards and put his feet up on his desk while he was talking on the phone.
【单选题】高处作业使用软梯、挂梯作业或用梯头进行移动作业时，软梯、挂梯或梯头上（）工作。作业人员到达梯头上进行工作和梯头开始移动前，应将梯头的挂钩口可靠封闭。
A.
不超三人
B.
允许两人
C.
只准一人
D.
以上都对
【单选题】David was standing on his chair to shout good news about gaining a new client to the rest of his colleagues. He fell off the chair and broke his arm. Who is responsible for the accident?
A.
David’s company
B.
The chair manufacturer
C.
David
D.
Both David and David’s company
【单选题】He __________ his chair backwards and put his feet up on his desk while he was talking on the phone.
A.
tilted
B.
lay
C.
shook
D.
trembled
【单选题】Suddenly, with a quick gesture he handed her back the glove and() his chair on the floor.
A.
preached
B.
glared
C.
scraped
D.
mighty
【单选题】Ben's face is pale and he is sitting back in his chair.
A.
probably lying
B.
probably telling the truth
【单选题】He _____ his right hand and then he was asked to ______ from his chair .
A.
raised ; rise
B.
rose ; raise
C.
raised ; raise
D.
rose ; rise
相关题目：