如果循环水起泡，应向循环水中加入消泡剂，常用的消泡剂有矿物油和（）。
A.硫酸
B.NaOH
C.植物油
D.NaHCO3
参考答案：C
回避型人格障碍特点是自幼胆小、行为退缩、心理自卑()
The low interest rates on banks loans provided an impetus for many to buy homes.
A．incentive
B．obstacle
C．reason
D．delay
