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【单选题】
集中供热系统热媒的选择，主要取决于各用户热负荷的特点和参数要求，也取决于热源的种类。集中供热系统的热媒主要是水与蒸汽。下列关于水与蒸汽的比较说法错误的是（）。A.
蒸汽热能利用效率高
B.
蒸汽输送距离远，供热半径大
C.
蒸汽的放热系数大，可节约用户的散热器面积，即节约工程的初投资
D.
蒸汽密度大，在高层建筑物中或地形起伏不平的区域蒸汽系统中，不会产生像水那样大的静压力，因此用户入口连接方式简单
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【单选题】—We can use QQ to communicate with each other online. —Good. Will you please show me ?
A.
which to use
B.
how to use it
C.
what to use
D.
where to use it
【单选题】–We can use it to chat with each other on the Internet. --Really? Will you please show me _______ it
A.
how to use
B.
what to use
C.
how can I use
D.
what can I use
【单选题】-We can use MSN to talk with each other on the Internet. -Really? Will you please show me ____ it? [ ]
A.
what to use
B.
how to use
C.
how can I use
D.
what can I use
【单选题】—We can use QQ to talk to each other online. —Good! Will you please show me _______ it?
A.
what to use
B.
where to use
C.
how to use
D.
when to use
【单选题】We don't have any pencils. Please don't . [ ]
A.
use up it
B.
use them up
C.
use it up
【单选题】——We can use QQ to chat with each other on the Internet. ——Really? Will you please show me ________ ?
A.
how to use it
B.
what to use it
C.
how can I use it
D.
what can I use it
【单选题】给出下面代码段,哪行将引起一个编译时错误?_______ public class Test { //1 int m, n; //2 public Test() {} //3 public Test(int a) { m=a; } //4 public static void main(String arg[]) { //5 Test t1,t2; //6 int j,k; //7 j=0; k=...
A.
line 3
B.
line 5
C.
line 6
D.
line 10
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