显示出目录下,以及其所有子目录的文件名的SOLARIS命令是().
A、ls–a
B、ls–t
C、ls–l
D、ls–R
参考答案:D
—How was your trip to Yancheng last week?
—Wonderful! I only felt sorry that I ________ the nature reserve of redcrowned cranes, but the weather was awful.
A.could visit
B.could have visited
C.might visit
D.might have visited
飞机抽油时,燃油是通过燃油系统的线路抽出()
A、供油总管经抽油活门进入加油总管
B、加油总管经抽油活门进入抽油管
C、供油总管经放油活门进入放油管
D、供油总管经应急放油口