因检验工操作不慎引起的误差叫（）。
参考答案：偶然误差
______ is no possibility _____ the shy girl can win the first prize in the English speech contest.
A．There; that
B．It; that
C．There; whether
D．It; whether
脊髓小脑性共济失调(SCA)伴眼底视网膜色素变性的亚型是
A．SCA1B．SCA3C．SCA5D．SCA7E．SCA3
