Plastics are low in both thermal conductivity and coefficient of thermal expansion.

第1题

Thermosetting plastics are generally better than thermoplastic plastics in toughness and impact resi

stance.

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第2题

We can use plastics as a substitute _______ wood.

A、of

B、to

C、for

D、instead of

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第3题

______ is the most effective approach to making plastic more environmentally friendly. A．Using biod

______ is the most effective approach to making plastic more environmentally friendly.

A．Using biodegradable plastics

B．Using photodegradable plastics

C．Recyclingplastics

D．Burning plastics for volume reduction and/or energy

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第4题

When making modern cameras , people began to_______ plastics for metal.

A.surround

B.substance

C.stretch

D.substitute

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第5题

______are used in plastic in order to protect plastics against deterioration due to environmental co

nditions

A．Lubricants B．Stabilizer C．Filler D．Accelerators

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第6题

ENUM类型的字段level定义为（LOW、MIDDLE、HIGH),ORDERBYlevelasc的顺序是（)

A、HIGH、LOW、MIDDLE

B、LOW、MIDDLE、HIGH

C、MIDDLE、LOW、HIGH

D、HIGH、MIDDLE、LOW

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第7题

A. high B. low C. down D. flavored

A.high

B. low

C. down

D. flavored

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第8题

Low fat milk is in the______.A．meat departmentB．fruit and vegetable departmentC．sweets dep

Low fat milk is in the______.

A．meat department

B．fruit and vegetable department

C．sweets department

D．dairy department

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第9题

She speaks in low ___.

A、voice

B、sounds

C、tones

D、volumes

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第10题

The majority of the employees have a () attitude to the low salary.

A.positive

B.mental

C.negative

D.vital

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