【单选题】According to the author, what do you think should be standing behind the door that the young courtier goes to open?
A.
Either, depending on the reader’s inclination.
D.
Neither, as it is the king’s test on the youth.
【简答题】甲酸钙广泛用于食品、化工、石油等工业生产上,300~400℃左右分解。Ⅰ、实验室制取的方法之一是:Ca(OH) 2 +2HCHO + H 2 O 2 = Ca(HCOO) 2 + 2H 2 O + H 2 ↑。 实验室制取时,将工业用氢氧化钙和甲醛依次加入到质量分数为30-70%的过氧化氢溶液中(投料物质的量之比依次为1∶2∶1.2),最终可得到质量分数98%以上且重金属含量极低的优质产品。 (1...
【单选题】下颌第一磨牙牙冠上不可能有的发育沟是( )。
【单选题】How have new media changed how consumers access the news?
A.
Now they spend much more time online.
B.
They have control over when and what news they watch.
C.
They share the news with their friends on social media sites.
D.
They don’t watch the news as much anymore.