A person can sue for nonperformance even if it is an illegal contract.（)
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对硬度在160HBS以下的低碳钢、低合金钢，为改善其切削加工性能，应采用的热处理工艺是（）
A. 调质
B. 渗碳
C. 球化退火
D. 正火
Federal antitrust laws provide only for government lawsuits.（)
An investment contract is a flexible standard for defining a security.（)
当混凝土泵车布料杆处于全伸状态时，不得移动车身。（)
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