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【简答题】
·You are in charge of technical resources in your company．You have just received a letter from the Customer Services Manager at JLM Communications，who are installing a new telephone switch board at your offices． ·Look at part of the letter below，on which you have already made some hand written notes． ·Then。using all your handwritten notes，write a letter to JLM’S Customer Services Manager． ·Write l20-140 Words ·You do not need to provide postal addresses．
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皮皮学刷刷变学霸
举一反三
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A.
静脉胆道造影
B.
核素扫描
C.
经皮肝穿刺胆道造影
D.
十二指肠低张造影
E.
腹腔动脉造影
【单选题】欲将P1口的高4位保留不变,低4位取反,可用指令是_____。
A.
ANL P1,#0F0H
B.
ORL P1,#OFH
C.
XRL P1,#0FH
D.
MOV P1,#0FH
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