输油管道上的阀门,应采用铸铁阀门。()
参考答案:错
Lingling switches on the laptop_____ opens a new document.She wants _____
write her homework.?[ ]
A. and; to
B. to; an
C. for; to
D. and; or
下列珍奇动物属于澳大利亚的一组是()①鸸鹋②巨嘴鸟③斑马④鸭嘴兽⑤羚羊
A.①②
B.③④
C.①④
D.④⑤