A:one needs to have profound knowledge
B:profound knowledge is important
C:profound knowledge is a must
D:it is required that one has profound knowledge
如图,在“研究力的合成”实验中,需要将橡皮条的一端固定在水平木板上,另一端系上两根细绳,细绳的另一端都有绳套.实验中需用两个弹簧秤分别勾住绳套,并互成角度地拉橡皮条.某同学认为在此过程中必须注意以下几项( )
阅读短文,判断对(T)错(F)
I'm Lingling. I have got a new bike. It's a nice bike. I go to school by bike every day. My mother is a teacher. Her school is near our home. So she walks to work. My father is a doctor. He goes to work by car.
____,引喻失义,____。