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【单选题】
Sometimes we are asked ______ we think the likely result of an action will be.
A.
that
B.
what
C.
which
D.
whether
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【简答题】已知int i;float f;,下列正确的语句是() A.(int f)%i; B.int(f)%i; C.int(f%i); D.(int)f%i;
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【单选题】You are inspecting the lower main precision bearings on a diesel engine .You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by _____.
A.
large dirt particles in the oil supply
B.
insufficient lubricating oil and overheating
C.
normal wear
D.
water contamination of the lube oil
【单选题】All diesel engines are classified as().
A.
four cycle
B.
compression ignition
C.
vacuum ignition
D.
external combustion
【单选题】When you experience and observe your inflection point, you should stop your career at once.
A.
Y
B.
N
C.
NG
【简答题】A、B、C、D、E为五种原子序数依次增大的短周期主族元素.已知B的最外层电子数与核外电子总数之比为3:4;D的最外层电子数与次外层电子数之比为3:4;E - 、C + 、A + 的半径逐渐减小;常温下化合物AE为气体. 请回答下列问题: (1)D、E的最高价氧化物对应水化物的酸性较强的是______(写化学式). (2)用惰性电极电解化合物CE的饱和溶液,当电路中有O.2mol电子通过时两极产生的...
【单选题】When you do an experiment, it is important that you have ____ patience to observe and record ___ whole process of the experiment [     ]
A.
a ; a
B.
the; the
C.
the ; a
D.
/; the
【单选题】对生物碱盐溶解度比较小的溶剂是( )
A.
乙醚
B.
甲醇
C.
乙醇
D.
酸水
E.
【简答题】(9分)目前世界上比较先进的电解制碱技术是离子交换膜法。 (1)电解前,如果粗盐中SO 4 2 ˉ含量较高,必须添加试剂除去SO 4 2 ˉ,则按添加试剂顺序,依次发生反应的离子方程式为 。 (2)补齐下列电解饱和食盐水制烧碱的离子方程式: ______________________ __________________________________ (反应物)                ...
【单选题】下述实验能达到预期目的的是 实验内容 实验目的
A.
向1mL0.2mol/LNaOH溶液中滴入2滴0.1mol/LMgCl 2 溶液,产生白色沉淀后,再滴加2滴0.1mol/LFeCl 3 溶液,又生成红褐色沉淀 证明在相同条件下,溶解度Mg(OH) 2 >Fe(OH) 3
B.
向混有BaCO 3 沉淀的NaOH溶液中滴入已知浓度的盐酸(用酚酞作指示剂) 滴定其中NaOH含量
C.
两种一元碱溶液X和Y(X的pH比Y大l),分别加水稀释l00倍后,pH相等 证明稀释前c(X)=10c(Y)
D.
测定等物质的量浓度的HF与HCl溶液的pH,后者较小 证明非金属性Cl>F
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