皮皮学，免费搜题
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【单选题】
参与血红素合成的基本原料是( )A.
珠蛋白、Fe 2+
B.
乙酰CoA、Fe 2+
C.
琥珀酸、Fe 2+
D.
乙酰CoA、甘氨酸、Fe 2+
E.
琥珀酰CoA、甘氨酸、Fe 2+
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反馈参考答案：
举一反三
【简答题】平面刮削有____平面刮削和____平面刮削;曲面刮削有内____面、内____面和球面刮削。
【单选题】It took me two weeks ______ reading the novels written by Lu Xun.
A.
finish
B.
to finish
C.
finished
D.
finishing
【简答题】农林废弃物中含有丰富的______、______和______。
【单选题】It took me two weeks ____ reading the novels written by Guo Jingming. .
A.
finish
B.
to finish
C.
finishes
D.
finishing
【单选题】It took me two weeks______ the novels_____ by Han Han.
A.
read, written
B.
to read, written
C.
reading, to write
D.
to read, wrote
【简答题】平面刮削有粗刮、细刮、精刮和（）等几个步骤。
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