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【简答题】
X、Y、Z、W是原子序数依次增大的四种短周期元素。X与W可形成正四面体型的共价化合物，Y的次外层电子数等于其最外层和最内层电子数之和的2倍，Y、Z的最外层电子数之和等于W的最外层电子数。 回答下列问题： （1）用化学符号表示X的一种核素 。 （2）写出Y的单质与X的最高价氧化物反应的化学方程式 。 （3）乙的单质在W的单质中燃烧，生成的产物中各原子的最外层均达到8电子稳定结构的分子属于 （填“极性分子”或“非极性分子”）。 （4）Y与W形成的化合物的电子式为 。 （5）与Z同主族的元素M可与X形成一种化合物，该化畲物是新近人工合成的比金刚石硬度大的无机非金属材料，其化学式为 。 （6）W的氢化物R是实验室一种常用试剂的主琴成分，该试剂可用于实验室多种气体的制备，写出实验室制取气体时满足下列条件的离子方程式。 ①R作氧化剂： 。 ②R作还原剂： 。
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【多选题】设某浮点数格式为:字长12位,阶码 6 位,用移码表示,尾数 6 位,用原码表示,阶码在前,尾数(包括数符)在后,则按照该格式: 已知X=-25/64, Y=2.875 ,求数据 X 规格化的浮点数形式(1),Y 规格化的浮点数形式(2) 。 已知Z的浮点数以十六进制表示为 9F4H ,则求 Z 的十进制真值(3)。
A.
1,00001 1.11001
B.
0,11111 1.11001
C.
1,00010 0.10111
D.
0,00010 0.10111
E.
-80
F.
-60
【单选题】中国甲公司向加拿大乙公司出口一批农产品,CFR价格条件。货装船后,乙公司因始终未收到甲公司的通知,未办理保险。部分货物在途中因海上风暴毁损。根据相关规则,下列那一选项是正确的?( )(司考)
A.
甲公司在装船后未给乙公司以充分的通知,造成乙公司漏保,因此损失应由甲公司承担
B.
该批农场品的风险在装港船舷转移给乙公司
C.
乙公司有办理保险的义务,因此损失应由乙公司承担
D.
海上风暴属不可抗力,乙公司只能自行承担损失
【简答题】《政府采购法》规定，政府采购一律实行集中采购。 ( )
【单选题】5 ) _____ many educators and parents have praised the Harry Potter series , some Christian parents have called for a ban on the books in their schools and libraries. Some churches have even gone as fa...
A.
although
B.
in addition
C.
such as
D.
however
E.
indeed
【单选题】In the U.S., the age-old problem of excessive drinking is taking a disturbing new turn and affecting new kinds of victims. On a New York subway train, a school-bound 15-year-old holds his books in one...
A.
Space Relationship
B.
Time Sequence
C.
Examples and Illustrations
D.
Compare and Contrast
E.
Cause and Effect
F.
Addition (Enumeration) simple listing
【单选题】5 ) _____ many educators and parents have praised the Harry Potter series , some Christian parents have called for a ban on the books in their schools and libraries. Some churches have even gone as fa...
A.
Although
B.
In addition
C.
Such as
D.
However
E.
Indeed
【单选题】5 ) _____ many educators and parents have praised the Harry Potter series , some Christian parents have called for a ban on the books in their schools and libraries. Some churches have even gone as fa...
A.
Although
B.
In addition
C.
Such as
D.
However
E.
Indeed
【单选题】5 ) _____ many educators and parents have praised the Harry Potter series , some Christian parents have called for a ban on the books in their schools and libraries. Some churches have even gone as fa...
A.
although
B.
in addition
C.
such as
D.
however
E.
indeed
【简答题】设某浮点数格式为:字长 12 位,阶码 6 位,用移码表示,尾数 6 位,用原码表示,阶码在前,尾数(包括数符)在后,则按照该格式: 已知 X=-25/ , Y=2.875 ,求数据 X 、 Y 的规格化的浮点数形式。 已知 Z 的浮点数以十六进制表示为 9F4H ,则求 Z 的十进制真值。
【简答题】12 已知数的补码表示形式如下,分别求出数的原码与真值。 ( 1 ) [X] 补 = 78H ( 2 ) [Y] 补 = 87H
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