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He cut ______his smoking.
A. in
B. up
C. back
D. down
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Make（ ）copies of important files, and store them on separate locations to protect your information.A.back B.back-up C.back-out D.background
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You are signing on a deck officer，who will be designated as one of the GMDSS operators，before sailing foreign．Which statement is TRUE ________．A.He/she must have an STCW certificate endorsed as“Valid for Service on Vessels Operating in the GMDSS System”B.He/she must present either an FCC-issued license or a Coast Guard-issued licenseC.You must consult the“List of Qualifications”on the reverse of his/her FCC-issued licenseD.His/her Merchant Mariners Document must have an added endorsement as “Radio Electronics Officer”
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Make（ ）copies of important files, and store them on separate locations to protect your information.A.back
B.back-up
C.back-out
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The working parent is not willing to listen to her (his) four-year-old child talking about hissandbox games because she (he) is___________.A.boring
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6、对于下述命令，如何利用pipe符号进行改写： by_cut ＜- group_by（diamonds, cut) count_cuts ＜- mutate（by_cut, N = n（))A．count_cuts ＜- diamonds %＞% group_by(cut) %＞% mutate(N = n())B．count_cuts ＜- diamonds %＞% mutate(N = n()) %＞% group_by(cut)C．count_cuts ＜- diamonds %＜% group_by(cut) %＜% mutate(N = n())D．count_cuts ＜- diamonds %＜% mutate(N = n()) %＜% group_by(cut)
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选择下列计算结果 cut2[x_]:=If[x＜-1,-1,If[x＜1,x,1]] {cut2[-1],cut2[0],cut2[2]} 或 cut2/@{-1,0,2}A．{-1,0,2}B．{-1,1,2}C．{-1,0,1}D．{-1,1,1}
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选择下列计算结果 cut1[x_]:=If[x＞11,-1,1] {cut1[-1],cut1[12],cut1[abc]}A．{1,-1,If[abc＞11,-1,1]}B．{1,-1,1}C．{-1,1,If[abc＞11,-1,1]}D．{1,-1-1]}
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