逆止阀是用来防止介质()的安全装置,当介质倒流时,阀瓣能()关闭。

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问题:

逆止阀是用来防止介质()的安全装置,当介质倒流时,阀瓣能()关闭。

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     Tim, Sonia, Jim, Tina, Jenny and Ann are in the classroom. They find (发现) a pencil-box, a ruler, a

pencil and a notebook on the desk. Tim asks Sonia, "Is this your pencil?" Sonia answers, "Yes, it is.

Thank you." Tim asks again, "Hi, Jim! Is this your ruler?" Jim answers, "No, it isn't. It's Tina's ruler." "Is

this your notebook, Jenny?" asks Tim. "Yes, it is," answers Jenny. "Ann, is this your pencil-box?" asks

Tim. "Yes, it is. Thank you." answers Ann.

根据短文内容,判断下列句子正(T)、误(F)。

( )1. Tim, Sonia, Jim, Tina, Jenny and Ann are at home.

( )2. They find a notebook, a pencil, a ruler and a pencil-box on the desk.

( )3. The pencil is Sonia's.

( )4. The ruler is Tim's.

( )5. The notebook is Jenny's.

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录井施工设计应对现场执行标准进行详细规定,现场执行标准应是()指定的技术标准。

A.录井施工合同

B.甲方上井检查人员口头通知

C.施工单位自身

D.行业推荐

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