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【单选题】
碳的两种同素异形体金刚石和石墨晶体结构如图（石墨晶体中是由一个个正六边形组成的片层结构，层与层之间靠微弱的范德华力结合）下列说法正确的是 金刚石 石墨A.
现代科技已经实现了石墨制取金刚石，该过程属于化学变化
B.
相同质量的金刚石与石墨晶体中，所含共价键数相同
C.
估计金刚石与石墨的熔沸点均较高，硬度均较大
D.
根据：C(金刚石,s)＋O2(g)===CO2(g)ΔH＝－395.41 kJ?mol－1 C(石墨,s)＋O2(g)===CO2(g) ΔH＝－393.5 kJ?mol－1 说明金刚石比石墨稳定，石墨转变为金刚石为放热反应
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举一反三
【单选题】According to the author of the passage, ______.
A.
life is really a long journey of joy for rich children
B.
the rich children feel greatly satisfied with the property they inherit from their parents.
C.
it is most important for wealthy parents to make sure that their families are rich in love as well as in money
D.
today all the wealthy parents are sure of the problems their money can bring
【单选题】What can we learn about the long distance journey by car?
A.
It is safe because the car usually goes at high speeds.
B.
It is monotonous because reading is quite impossible.
C.
It is exhausting because you seldom manage to sleep.
D.
It is dangerous because the traffic is always too dense.
【单选题】It is a long journey ___ South Africa ___ Scotland.
A.
from---- to ---
B.
next--to----
C.
near---to----
D.
begin---- to----
【多选题】在记账本的登陆界面中，设置密码为密文显示，可以设置EditText的inputType属性的值为（）
A.
textPersonName
B.
editTextPassword
C.
numberPassword
D.
date
【单选题】It is a long journey ___ South Africa ___ Scotland.
A.
from...to...
B.
since... to...
C.
next...to...
D.
begin...to...
【判断题】《小企业会计准则》自 2013年1月1日起在全国小企业范围内实施,原《小企业会计制度》废止。 已选择执行《企业会计准则》的小企业,不得在执行《企业会计准则》的同时,选择执行《小企业会计准则》的相关规定。
A.
正确
B.
错误
【简答题】How did the author summarize their long journey of love? (Para.11) (Para.11) Our faithful journey of love and learning took us down rocky roads of hardship and on smooth easy-going highways. It is a l...
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