【单选题】[7-46]If a vessel lists to port, the center of buoyancy will ___.假如船舶左倾,浮心将向左边移动。
B.
move to starboard 向右移动
C.
move directly down 向下移动
D.
stay in the same position在同一位置
【单选题】Which vessel is required to participate in STRAITREP?______
A.
Vessels of less than 50min length.
B.
Vessels of any tonnage carrying perishable cargo.
C.
Vessels engaged in towing or pushing with a combined GT of 300 at most.
D.
All passenger vessels that are fitted with VHF, regardless of length or GT.
【单选题】复杂曲线的气割在曲线段,割炬必须()于工件表面。
【简答题】根据题目所给信息判断各物质的结构,按要求回答问题. (1)某苯的同系物的分子式为 C 9 H 12 的核磁共振氢谱只有两个吸收峰,该分子的结构简式为______. (2)当0.1mol 烃 A 在氧气中完全燃烧时生成CO 2 和H 2 O各0.6mol,催化加氢后生成2,2-二甲基丁烷,则A的结构式为______. (3)根据所给信息,写出分子式为C 6 H 12 的某烯烃的结构简式: ①若该烯烃...
【简答题】33+30→( )÷7→( )×9→( )- 46→( )÷5→( )÷7→( )
【判断题】Win 7 中,同一文件夹下允许两个文件同名。
【单选题】[7-36]The center of flotation of a vessel is ___.
A.
The center of volume of the immersed portion of the vessel
B.
The center of gravity of the water plane
C.
That point at which all the vertical downward forces of weight are considered to be concentrated
D.
That point at which all the vertical upwar
【单选题】C# 下列哪些语句可以创建一个具有 3 个初始值为 ”” 的元素的字符串数组?
A.
string StrList[3](””);
B.
string[3] StrList={””,””,””};
C.
string[] StrList={””,””,””};
D.
string[] StrList=new string[3];
【单选题】( )是指工作负责人、专责监护人必须始终在工作现场,对工作人员的安全认真监护,及时纠正违反安全的行为和动作的制度。