脊柱结核时,受累椎间盘的信号改变为()
A.T1WI呈高信号
B.T2WI呈高信号
C.T1WI呈低信号
D.T2WI呈中等信号
E.脂肪抑制图像呈低信号
参考答案:C
下列离子方程式书写正确的是( )
A.铝粉投入到NaOH溶液中:2Al+2OH-══ 2AlO2-+H2↑
B.AlCl3溶液中加入足量的氨水:Al3++ 3OH- ══ Al(OH)3↓
C.三氯化铁溶液中加入铁粉
D.FeCl2溶液跟Cl2反应:2Fe2++Cl2=2Fe3++2Cl-
A motorcycle ________by electric power, which does good to the environment, becomes quite popular in our city.[ ]
A. driven
B. being driven
C. to be driven
D. is driven