自流注入防冻剂是利用液柱自身的(),将防冻剂注入管线。
A、体积
B、压头能量
C、高度
D、重量
参考答案:B
下列字形全对的一项是( )
A.仓皇掎角之势鸠占雀巢兵来将挡,水来土淹
B.床第矫揉造作平心而论有志者事竞成
C.渲泄饮鸩止渴鬼鬼崇崇知己知彼,百战不殆
D.青睐矢口否认崭露头角天下没有不散的筵席
I _____ to help you to do homework but I couldn’t spare any time. I _____ a composition last night and I’ll finish it today.
A.wanted; wrote
B.had wanted; was writing
C.have wanted; wrote
D.wanted; have been writing