正确答案：A

41.When the solution containing suspended substances is heated,zeolite or glass beads should be added to avoid the phenomenon of boiling.（）

A.正确

B.错误

正确答案：A

42.The remaining sodium metal（Na）after the experiment should be rinsed with plenty of water.（）

A.正确

B.错误

正确答案：B

43.Exothermic reactions cannot be carried out in closed glass containers when organic synthesis is carried out in the laboratory.（）

A.正确

B.错误

正确答案：A

44.You can weigh sodium peroxide on paper.（）

A.正确

B.错误

正确答案：B

45.Acetic acid vapor and air mixture won’t explode under heat source induced.（）

A.正确

B.错误

正确答案：B

46.Heating electric furnace can be directly used in wood or plastic laboratory bench.（）

A.正确

B.错误

正确答案：B

47.Students should receive safety education and training,and pass the examination before entering the laboratory to study and work.（）

A.正确

B.错误

正确答案：A

48.The place that produces static electricity easily should keep the ground wet,or lay the floor with good electric conductivity.（）

A.正确

B.错误

正确答案：A

49.Eating,drinking,smoking,applying cosmetics or lip balm,and handling contact lenses are prohibited in all laboratories.（）

A.正确

B.错误

正确答案：A

50.15.Personal protective equipment(PPE)is an essential element of primary containment and laboratory safety.

正确(正确答案)

错误