关于肝性脑病的发病机制有很多学说,下列学说中未被认可的是()
A.假性神经递质学说
B.氨基酸中毒学说
C.氨中毒学说
D.γ-氨基丁酸(GABA.学说
参考答案:B
It is uncertain____side effect the medicine will bring about,although about two thousand patients have taken it.
A.that
B.what
C.how
D.whether
()捻钢丝绳有半数股左旋,半数股右旋。