佝偻病轻度“O”型腿标准是两足跟靠拢,膝关节间距小于()
A.2cm
B.3cm
C.3~6cm
D.3~4cm
E.6cm
参考答案:B
特制血小板现分为几种()?
A.2种
B.3种
C.4种
D.5种
E.6种
You have done so much work—you ______ pass the exam.
A.are likely to
B.have to
C.can
D.are bound to