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【单选题】
呼吸商接近 1 时,体内主要供能物质是:( )A.
糖
B.
脂肪
C.
蛋白质
D.
糖和脂肪
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举一反三
【简答题】Shelly__________California for Texas in 1996 and__________there ever since. A．left;worked B．has left;had worked C．left;has worked D．has left;worked
【简答题】A．Jack has made others wait before. B．Jack has often had to wait for Shelly. C．Jack enjoys playing tricks with others. D．Jack doesn't usually make people wait.
【单选题】下列有关流砂和管涌的概念正确的说法是( )。
A.
发生流沙时水流向上渗流,发生管涌时水流向下渗流
B.
流沙多发生在粘性土中,管涌多发生在无粘性土中
C.
流沙属于突发性破坏,管涌属于渐进性破坏
D.
流沙属于渗流破坏,管涌不属于渗流破坏
【多选题】关于基坑突涌说法正确的是（ ）
A.
基坑突涌是由于基坑隔水底板厚度小于含水层顶面的承压水头值引起的
B.
开挖基槽时保留的安全厚度与承压水水头高度成正比
C.
当基坑底为隔水层，应进行坑底突涌验算，必要时可采取水平封底隔渗或将井点管伸入承压水位释放水压，保证坑底土层稳定
D.
当地下承压水流量大时，不宜采用轻型井点，应用出水量较大的喷射井点或管井井点降水
【单选题】If metal is heated and then cooled very quickly, , by dipping in cold water, it will be very hard but will break easily.
A.
what’s more
B.
in general
C.
for example
D.
on the other hand
【单选题】Shelly ______ California for Texas in 1996 and ______ there ever since. [ ]
A.
left; worked
B.
left; has worked
C.
has left; had worked
D.
has left; worked
【单选题】Shelly has been preparing carefully for the driving test so that she can be sure of passing it at her first________.
A.
intention
B.
purpose
C.
attempt
D.
desire
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