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【简答题】
测定银的水样,应用____酸化至pH____,贮存于____瓶中。
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【单选题】A computer network links computers together to allow users to share hardware, software, and(73)
A.
resource
B.
file
C.
information
D.
data
【单选题】We asked both John and Jerry,but______could offer a satisfactory explanation.
A.
neither
B.
either
C.
both
D.
nor
【单选题】●A multimedia system allows end users to share，transfer and process avariety of forms of information in a (75) manller. (75)
A.
fixed
B.
fix
C.
unifying
D.
unified
【简答题】容器在使用前必须经过洗涤,盛装测金属类水样的容器,先用___,用开水冲洗,再用___的盐酸或硝酸浸泡8h,用自来水冲洗,清洗干净
【单选题】Suppose users share a 2 Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. Suppose now there are three users. F...
A.
0.001
B.
0.002
C.
0.004
D.
0.008
【单选题】Suppose users share a 2 Mbps link. Also suppose each user transmits continuously at 1 Mbps when transmitting, but each user transmits only 20 percent of the time. When circuit switching is used, how m...
A.
1
B.
2
C.
3
D.
4
【单选题】A multimedia system allows end users to share, transfer and process a variety of forms of information in a(70)manner.
A.
fixed
B.
fix
C.
unifying
D.
unified
【单选题】Jerry has promised to keep the secret, so he won't tell anyone ________ asked to.
A.
until
B.
now that
C.
unless
D.
even though
【单选题】I asked Jerry and Ken to come to my house for study, but ______ of them came. [ ]
A.
none
B.
either
C.
neither
D.
both
【单选题】The purposes for several users to share a mainframe are ______.
A.
to divide the cost of the equipment among them
B.
to utilize the equipment to the maximum extent
C.
to produce fewer PCs
D.
both A and B
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