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【多选题】
以下阐述正确的有:A.
化学纤维以天然或人工合成的高聚物为原料，经特定的加工制成。
B.
再生纤维（人造纤维）以天然高聚物为原料，经特定的加工制成。
C.
合成纤维以人工合成的高聚物为原料，经特定的加工制成。
D.
天然纤维是指在自然界中生长形成或与其他自然界物质共生在一起，可直接用于纺织加工的纤维。
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举一反三
【单选题】The ____ from tourism is the biggest single contribution to GDO in the Maldives; every year many tourists from all corners of the world spend their holidays there.
A.
annual
B.
manual
C.
avenue
D.
revenue
【简答题】理想运放的开环电压增益趋向于 。
【单选题】The from tourism is the biggest single contribution to GDP in the Maldives; every year many tourists from all corners of the world spend their holidays there.
A.
application
B.
revenue
C.
incentive
D.
suffice
【简答题】(2) The__________ from tourism is the biggest single item in the country's invisible earnings.
【简答题】当运算放大电路的输入电阻 趋向于【 】,开环电压放大增益 A 趋向于【 】时,则实际运放就变成理想运放。
【简答题】The____(收入)from tourism is the biggest single contribution to GDP in the Maldives; every year many tourists from all corners of the world spend their holidays there.
【单选题】The revenue from tourism is the biggest single item in the country's invisible earnings.
A.
newcome
B.
welcome
C.
income
D.
outcome
【简答题】The ( ) from tourism is the biggest single contribution to GDP in the Maldives; every year many tourists from all corners of the world spend their holidays there.
【单选题】The ________ from tourism is the biggest single contribution to GDP in the Maldives; every year may tourists from all corners of the world spend their holidays there.
A.
avenue
B.
deposit
C.
revenue
D.
interest
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