具有操作灵活、运转方便、所需土作场地小等特点的土方路堑施工中最常用的施工机械是（）。
A．推土机
B．挖掘机
C．铲运机
D．挖土机
参考答案：A
用括号里的词的适当形式填空。
1. I have lost the address. What______ I _______(do) ?
2. Could you please______ (not laugh) at others?
3. After an hour, they _______ ( finish)their homework and ______(go) shopping.
4. The parents are always________ (complain)about their children's rudeness(无礼、粗鲁).
5. They don't know why you talked to them so _______(angry) .
小儿急性阑尾炎的特点是（）
A.病原菌多为需氧菌与厌氧菌混合感染
B.多数患儿早期即出现腹泻
C.多数患儿以转移性右下腹痛为主诉
D.因腹痛常辗转不宁，烦躁不安
E.以上均是
