填空题

易爆材料；（）安全耳罩

【参考答案】

D；Q

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热门试题

单项选择题

A．reading an ebook you’ve downloaded
B．turning a print book into a digital version
C．downloading an ebo0k from the Internet
D．copying an ebook onto a portable computer

单项选择题

What is required of all domestic and international passengers for check-in（）

A．An invitation letter.
B．A company’s job Offer.
C．An official photo identification.
D．An official immigration permit.