下列各式的值等于5的是 [ ]
A.∣﹣9∣+∣+4∣
B.∣(﹣9)+(+4)∣
C.∣(+9)﹣(﹣4)∣
D.∣﹣9∣+∣﹣4∣
答案:B
—what do you think of the matter?
—Don’t you remember I have already ________ that it was troublesome?
A.made it clear
B.made clear
C.took it for granted
D.made sure
清水箱内的加热器如何工作?