压颈试验检查的目的是确定()。
A.脊髓疾病伴椎管梗阻
B.颈椎病变
C.小脑痛变
D.周围神经疾病
E.脑干疾病
参考答案:A
Two or three years ago this kind of glasses _______ a favorite for some time, but now it _______.
A.were, has gone over
B.was, has gone out
C.was, has gone away
D.were, is going down
集热箱中盛有1吨水,在阳光照射下,水温度升高了30℃,在这个过程中,水的热能增加了多少?