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（16分 ）镁可与其他金属构成合金。镁铝合金的强度高，机械性能好。有“国防金属”的美誉。自然界中的镁元素主要存在中。海水中镁的总储量约为1.8×10 15 t。从海水中（主要含含Na + ，Cl — ，Mg 2+ 等离子）提取镁的工艺流程图如下： （1）A物质的化学式为 。操作1的名称为 。 （2）试写出向固体A中加入足量盐酸的离子方程式 。 （3）该反应的副产物主要有 等。 （4）若开始得到的固体A的质量为116g，不考虑物质的损失，则最后生成的Mg的物质的量为 mol。
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【单选题】The rivers and forests of the New World were ______ with fish and game.
A.
sufficient
B.
enough
C.
adequate
D.
abundant
【简答题】若是单杆活塞式液压缸差动连接时的运动速度等于有杆腔进油时的反向运动速度,则活塞杆的直径d与缸筒内径D之间的关系是d= ( )D。
【单选题】The soil in this part of the world is not rich enoug h to _____ a large population.
A.
sustain
B.
dwell
C.
conceive
D.
recoil
【单选题】The soil in this part of the world is not rich enoug to _____ a large population.
A.
sustain
B.
dwell
C.
conceive
D.
recoil
【简答题】若是单杆活塞式液压缸差动连接时的运动速度等于有杆腔进油时的反向运动速度,则活塞杆的直径 d 与缸筒内径 D 之间的关系是 d= D。
【单选题】Which of the following is true, according to the conversation?
A.
His roommate is kind enough to freeload.
B.
His roommate is reimbursing for grocery.
C.
His roommate is taking advantage of him.
D.
His roommate is not honest enough to go straight.
【单选题】有关医疗用气雾剂的抛射剂的质量要求,错误的是:()
A.
常压下沸点低于40.6℃
B.
常温下蒸汽压应小于大气压
C.
不易燃、不易爆
D.
无致敏性
E.
来源广、价格便宜
【单选题】It is quite common for a working man to make ______ for his old age by putting aside enough money to live on.
A.
adjustment
B.
supply
C.
assurance
D.
provision
【单选题】With larger numbers of undergraduates than ever before, just having a degree will no longer be enough to make you ___ from the crowd.
A.
stand up
B.
stand by
C.
stand for
D.
stand out
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