下述哪种情况不宜作为葡萄胎预防性化疗的条件()
A.年龄大于40岁
B.β-HCG大于100KIU/L
C.黄素化囊肿大于6cm
D.无条件随访
E.部分性葡萄胎
参考答案:E
It was hard for him to fit in a new class, in which ______ he was familiar with.
A.each
B.neither
C.both
D.none
要采到符合精密度要求的煤样,应符合()原则。
A.采样工具
B.煤的品种
C.子样质量
D.子样数目