题目内容

黑色标记剥离试验从头到底1cm划线,用手剥离。( )

A. 对
B. 错

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轮廓标外观质量求为表面无污损。( )

A. 对
B. 错

轮廓标人工气候加速老化试验时间为1500h.( )

A. 对
B. 错

根据情境，选择正确的句子填空。Waiter: Good afternoon, madam.Guest: Not quite. I think we need a little bit longer. Waiter: On the special board today we have roast salmon, vegetarian pasta and turkey sandwichGuest: It all sounds so niceWaiter: _Waiter: Excuse me, madam. May I take your order now?Guest: Yes, please. I'd like a classic chef salad, a vegetarian pasta and a beef steakWaiter: Sure, madam. _Rare, medium or well done?Guest: Rare, pleaseWaiter: Excellent choice. _Guest: Coke, pleaseWaiter: Yes, madam.______ Is that right?Guest: Exactly.Waiter: Thank you, madam. Just a moment, pleaseA.Please take your time. I'll be back in a few minutes later….B. How would you like your steak, madam?C. Are you ready to order?D.What would you like to drink?E.What do you have for today's special?F.Let me repeat your order You would like a classic chef salad. a vegetarian pasta, a rare beef steak and a Coke.

一线偏振光通过λ/4波片后，其偏振态为（）。

A. 仍为线偏光；
B. 变为圆偏振光；
C. 变为椭圆偏振光；
D. 不确定。