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Lesson Two extended number practice--Listen and fill in the blanks with numbers-1(只填数字或字母,没有空格) 1. FL_____2. Car_____, go ahead,3. Heading______4. Wind____ 5._____knots6. Maintain ______knots,7. pacific _______ heavy8. visibity_______9. Squawk______10. ______ POB

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Lesson Two extended number practice--Listen and fill in the blanks with numbers-2 1. Time check ____2. mach ______3. maintain ______4. Airbus _______5. _______6. FL______7. heading _______8. wind ______degrees ______knots gusting ______,9. visibility _______.

Lesson Two extended number practice--Listen and fill in the blanks with numbers-3 跑道左或右只需要写一个大写字母就可以 1. Mach _____2. cloud, few _____3. RVR ______4. QNH ______5. Runway ______6. Estimating PQL time _____7. Reduce _______knots,8. report passing ______

欲把当前目录下的 file1.txt 复制为 file2.txt,正确的命令是( )。 [单选题]

A. copy file1.txt file2.txt
B. cat file1.txt > file2.txt
C. cat file2.txt file1.txt
D. cp file1.txt| file2.txt

下列文件中,包含了主机名到IP 地址的映射关系的文件是( )。 [单选题]

A. /etc/hostname
B. /etc/hosts
C. /etc/resolv.conf
D. /etc/networks

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