双排脚手架应设置剪刀撑与斜撑，单排脚手架应设置剪刀撑，且每道剪刀撑宽度不小于四跨，且不应小于6m，那么剪刀撑与地面的夹角应该在什么范围之内？() [单选题]
A：30°～45°
B：45°～60°
C：45°～75°
在钢丝绳连接中，每一处连接点需要使用绳夹固定，那么当钢丝绳公称直径40mm时应加设多少绳夹（ ）
What is the first thing to do when a water sample comes into a lab?
1. Refrigerate the sample
2. Take the pH of the sample
3. Log in and assure chain of custody of the sample
4. Analyze the sample
A combustible liquid is best defined by one of the following:
1.Any liquid having a flash point above 100°F and below 140°F
2. Any liquid having a flash point at or above 100°F
3. Any liquids having a flash point above 140°F
4. Class ll liquids having flash points at or above 100%F and below 140°F
Which of the following is an example of a program sponsored by an Employee Assistance Program?
1. Smoking cessation
2. Occupational counseling
3. Substance abuse counseling
4. Allof the above
