熔焊接头的基本形坡口是一种形状简单、加工容易、应用普遍的坡口,按照我国标准规定可分为( )。
A.带钝边U形坡口
B.I形坡口
C.单边V形坡口
D.双Y形坡口
参考答案:B,C
用所给动词的适当形式填空。
小题1:My dream is_________(become) a great writer like MoYan.
小题2:The museum_________(build) eight years ago.
小题3:We _________ (learn) 3,000 English words by the end of last term.
小题4:He was last seen_________ (leave) his office in New Town at about 7.pm
小题5:Although shopping online is fast and easy, you’d better __________(not be) crazy about it.
摩西一生的年日是:()
A、120;
B、150;
C、130。