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【多选题】
生物流化床是以( )作填料。A.
碎石
B.
无烟煤
C.
半软性填料
D.
砂
E.
活性炭
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】I am wondering when Tom is going to ___ and get married.
A.
stress out
B.
run through
C.
meet up
D.
settle down
【单选题】I am wondering when Tom is going to _________ and get married.
A.
stress out
B.
save up
C.
meet up
D.
settle down
【单选题】I am wondering when Tom is going to _________ and get married.
A.
venture
B.
linger
C.
settle down
【单选题】I am wondering when Tom is going to ___________ and get married.
A.
settle down
B.
ran through
C.
settle in
D.
run out
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