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【多选题】
关于孕核算方法,哪些说法是正确的?( )A.
月经周期不规则,根据性交日期推算
B.
月经周期规则,按末次月经第一天计算
C.
孕20,根据超声测量顶臀径或推算
D.
不论孕月大小,根据超声测量顶臀径或推算
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】They have been trying to arrive at a practical solution______ the problem.
A.
in
B.
on
C.
to
D.
with
【简答题】Were they to arrive before we depart the day after tomorrow, we (have) a wonderful dinner party.
【单选题】When customers arrive, they have to _______.
A.
take off their shoes
B.
put on sun glasses
C.
put their phones in a locker
【简答题】They have been trying to arrive at a practical solution ________ the problem. A) in B) to C) on D) with
【单选题】They have been trying to arrive at a practical solution ________ the problem.
A.
in
B.
to
C.
on
D.
with
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