关于储金球的说法中正确的是 A．可补偿合金凝固收缩 B．可避免

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问题多项选择题

关于储金球的说法中正确的是

A．可补偿合金凝固收缩

B．可避免铸件收缩

C．直径略大于铸件蜡型最厚处

D．位置距蜡型1mm

E．应在铸圈的温度中心区

答案

参考答案：A,B,C,E

选择题

Avril Lavigne _______ to be a rock superstar because she ______ rock music even in her childhood.

A．promised; was drunk with

B．expected; was drunk in

C．wished; was drunk for

D．wanted; was drinking with

判断题

两性离子聚合物完井液通常是在进入储层前，对两性离子聚合物钻井液和低固相两性离子聚合物钻井液进行改造而成的。