钒在钢中能提高钢的强度极限、屈服极限和弹性极限。
参考答案：对
A client who has been admitted to the emergency room is restless and agitated, has dry mucous membranes, and is complaining of intense thirst. The nurse suspects which of the following electrolyte imbalances
A. Hypokalemia.B. Hypercalcemia.C. Hypomagnesemia.D. Hypernatremi
氢气在聚合反应中的重要作用是（）。
A、调节产品分子量
B、活化主催化剂
C、调节产品等规度
D、调节产品黄色指数
