We took usual steps:sounding the depth，reversing and stopping engine，paying out anchor and 60 fathoms of chain cable in the depth of 12 fathoms．The operation above is（）.

[单选题]甲、乙为多年同窗，他们一起买了一套住房，关于他们之间的关系的下列论述，(    )是正确的。

[问答题]如何验算建筑结构基础的抗震承载力？

[名词解释题]年龄众数

[填空题]公文正文结尾的写法多种多样，比较常用的有（）、（）、（）、（）、（）。

[单选题]齿面硬度为56〜62HRC的合金钢齿轮的加工工艺过程为（）。

[单选题]SSL服务器数字证书密钥位长为（）

[多选题]甲、乙、丙三人共同组建一有限责任公司。公司成立后，甲将其20％股权中的5％转让给第三人丁，丁通过受让股权成为公司股东。甲、乙均按期足额缴纳出资，但发现由丙出资的机器设备的实际价值明显低于公司章程所确定的数额。对此，下列表述中错误的有( )

[名词解释题]组合列车

[填空题]用于PCR的DNA多聚酶，即TaqDNA多聚酶有如下特点：（）、（）、（）。

[单选题]四逆散的君药为（　　）。

[单选题]We took usual steps:sounding the depth，reversing and stopping engine，paying out ...

[单选题]We took usual steps:sounding the depth, reversing and stopping engine,paying out...

[单选题]A vessel sounding a fog signal of one short，one prolonged，and one short blast is...

[单选题]A vessel sounding a fog signal of one short，one prolonged，and one short blast is...

[单选题]A continuous sounding of a fog-signal apparatus indicates（）.

[单选题]The first the Second Mate knew of the fire was the sounding of the emergency ala...

[单选题]A continuous sounding of a fog-signal apparatus indicates（）.

[单选题]Continuous sounding of a fog whistle by a vessel is a signal（）.

[单选题]Continuous sounding of a fog whistle by a vessel is a signal（）.

[单选题]You must take the（）steps by yourself; after you have begun, I will help you.