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【简答题】
小家安装了一台太阳能热水器，晴天可利用太阳能集热，阴雨天可用电辅助加热，铭牌如下： （1）若平均每平方米面积上每小时接收的太阳能约为2.8×10 8 J。该热水器接受太阳能的有效面积为1.5m 2 ，每天日照时间8h，则它1天中接收的太阳能E约为多少？若太阳能装满水，这些太阳能有60%被热水器吸收，则可使水温升高多少？[水的比热容为4.2×10 3 J/（kg·℃） 取g=10N/kg ] （2）若该热水器1天中接收的太阳能由电加热提供，则热水器正常工作的电流是多少？热水器需正常工作时间是多长？ （3）一天，小饭后用电烧水，发现将贮满水的热水器中的水从20℃升高到60℃，晚上比白天烧水用的时间长，原因是：_________________________________，他仔细查看了太阳能热水器的说明书，发现其发热体就是一根电热丝。他想将它改造一上，使其加热时间缩短，请你给他提出一种改造的方案：____________________________________。 （4）请从能源和可持续发展的角度，说出提倡开发利用太阳能的主要理由；说出当前利用太阳能方面所面临的主要问题。
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【单选题】A credit with a clause which authorizes the advising bank to make an advance payment to the beneficiary is called a/an______.
A.
back-to-back credit
B.
red clause credit
C.
irrevocable credit
D.
open-ended credit
【判断题】A simple sentence consists of a single clause which contains a subject and a predicate and stands alone as its own sentence.()
A.
正确
B.
错误
【多选题】Which two statements are true regarding the ORDER BY clause? （）
A.
It is executed first in the query execution
B.
It must be the last clause in the SELECT statement
C.
It cannot be used in a SELECT statement containing a HAVING clause
D.
You cannot specify a column name followed by an expression in this clause
E.
You can specify a combination of numeric positions and column names in this clause
【简答题】Premiere 编辑的最小时间单位是( )。
【多选题】Which two statements are true regarding the ORDER BY clause?（）
A.
The sort is in ascending by order by default.
B.
The sort is in descending order by default.
C.
The ORDER BY clause must precede the WHERE clause.
D.
The ORDER BY clause is executed on the client side.
E.
The ORDER BY clause comes last in the SELECT statement.
F.
The ORDER BY clause is executed first in the query execution.
【单选题】Which of the following contains an adverbial clause of cause?
A.
Which of the following contains an adverbial clause of cause?
B.
As there was no answer, I wrote again.
C.
You must do the exercises as I show you.
D.
Wealthy as he is, Mark is not a happy man.
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