（）is a single-user multi-task operating system .A.MS-DOSB.WindowsC.UNIXD.Linux

A.shutdown -d

B.shutdown -s

C.shutdown -m

D.shutdown -Fr -s 1

● (74) is a single-user multi-task operating system．

(74)

A． MS-DOS

B． Windows

C．UNIX

D．Linux

A. Reset the root password.

B. Press the space bar.

C. Type recovery.

D. Press the "Enter" key.

A. You must have a console connection.

B. You cannot set the console port to an insecure mode.

C. You must press the Enter key so that you can boot into single-user mode.

D. When prompted to enter the full pathname of the shell, you must press the Enter key.

A.M=m

B.m⊆M

C.m∈M

D.m∉M

A.7．0μm

B.6．0μm

C.5．5μm

D.5．0μm

E.4．5μm

A.M=M且H(M’)＝H(M)

B.M’≠M且H(M’) ≠H(M)

C.M’≠M但H(M’)＝H(M)

D.M’=M但H(M’) ≠H(M)

A.200μm, 300μm, 600μm

B.200μm, 320μm, 400μm,600μm

C.200μm, 300μm, 400μm,600μm

D.200μm, 300μm, 500μm, 600μm

A.0.1μm、0.2μm、0.3μm、0.5μm

B.0.1μm、0.2μm、0.3μm、0.5μm、1μm

C.0.2μm、0.3μm、0.5μm、1.0μm

D.0.1μm、0.2μm、0.3μm、0.5μm、1μm、5μm

A.m[0] m ＜ d

B.m[0] d ＞ m

C.m m ＜ i

D.m d ＞ d