由于矿石初选工况较为恶劣,因此在这一工段,渣浆泵的使用寿命普遍()。
参考答案:较低
促进钙和磷吸收的物质是()。
A.维生素D
B.维生素A
C.降钙素
D.甲状旁腺激素
E.生长激素
Dear, I'll definitely take you to Shanghai next month _____ you perform well in this midterm examination. [ ]
A. in case
B. now that
C. so long as
C. so that