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【单选题】
制作富血小板血浆的方法A.
1000r/min，离心10min
B.
1200r/min，离心10min
C.
1500r/min，离心20min
D.
2000r/min，离心20min
E.
3000r/min，离心20min
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举一反三
【单选题】—Does your father often play with you? —_____. [ ]
A.
Yes, he is
B.
Yes, seldom
C.
No, never
D.
No, he often plays
【单选题】He often ______ ping-pong with his friends. Now they ______ ping-pong at school. [ ]
A.
play; are playing
B.
plays; play
C.
plays; are playing
D.
plays; is playing
【单选题】He often practice _____ the piano in his room. [ ]
A.
play
B.
playin g
C.
to play
D.
played
【单选题】He often speaks the role he played in the play, ______ made others upset. [ ]
A.
which
B.
that
C.
where
D.
when
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