压边圈能预防板料在拉深过程中产生()现象。
A.起皱
B.变形
C.振动
参考答案:A
根据《中华人民共和国合同法》的规定,下列合同中,属于无效合同的有( )。
A.一方以欺诈手段使对方在违背真实意思情况下订立的合同
B.损害社会公共利益的合同
C.以合法形式掩盖非法目的的合同
D.显失公平的合同
Planning and scheduling are ().
A.separate and distinct tasks and have little relationship to each other
B.the only means for assuring project resources
C.distinct but inseparable aspects of the successful project
D.tasks which take place in parallel in a project environment