原始的地球大气中存在的气体是()。
A.H2
B.CO
C.O2
D.H2S
参考答案:A, B, D
— Oh,! I failed in the exam.
— _______.You still have chance. [ ]
A. Take your time
B. Don't lose heart
C. Don't lose your heart
D. No pains, no gains
脊髓小脑性共济失调的临床特点包括()
A.共济失调多始于下肢
B.遗传早现现象
C.Gower征
D.Babinski征阳性
E.CSF蛋白质增高