题目内容

AllofthefollowingareengagedinfishingEXCEPT（）.

Avesseltrawling
B. Avesseltrolling
C. Avesselsettingnets
D. Avesseltendinglines

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被子植物无孢子生殖的胚来自（）

A. 未受精的卵细胞
B. 助细胞、反足细胞或中央细胞
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A. anoff-centerTCG
B. anLCGgreaterthanlevelvesselLCB
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Openthe（）beforestartinganaircompressor.

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Openthe（）ofintercoolerbeforestartinganaircompressor.

A. cylindercover
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C. oilcup
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