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【单选题】
下图为某单基因遗传病的系谱图，有关判断正确的是（）A.
该遗传病为隐性性状
B.
致病基因位于X染色体上
C.
Ⅱ3一定是携带者
D.
Ⅱ3和Ⅱ4的基因型相同
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举一反三
【单选题】No person may serve as the person in charge of both the vessel and the facility during oil transfer operations unless ______.
A.
there is ready access between the two
B.
the vessel and facility are immediately adjacent
C.
the person in charge has a rapid means of transportation between the two
D.
the Captain of the Port authorizes such procedure
【单选题】The manager came over and asked the customer how .
A.
did the quarrel came about
B.
the quarrel had come about
C.
had the quarrel come about
D.
had the quarrel came about
【简答题】In our company, great changes (take place) ______ since the new manager came.
【单选题】图示两均质细杆OA与AB铰接于A,在图示位置时,OA杆绕固定轴O转动的角速度为ω,AB杆相对于OA杆的角速度亦为ω,O、A、B三点位于同一铅直线上。已知OA和AB两杆的质量均为m,它们的长度均为L,则该系统此时对O轴的动量矩大小为I O 为
A.
I O =21mL 2 ω/6;
B.
I O =11mL 2 ω/4;
C.
I O =8mL 2 ω/3;
D.
I O =5mL 2 ω/3.
【单选题】图示两均质细杆 OA 与 AB 铰接于 A ,在图示位置时, OA 杆绕固定轴 O 转动的角速度为 w , AB 杆相对于 OA 杆的角速度亦为 w , O 、 A 、 B 三点位于同一铅直线上。已知 OA 和 AB 两杆的质量均为 m ,它们的长度均为 L ,则该系统此时对 O 轴的动量矩大小 L O 为 ( ) 。
A.
L O =21 mL 2 w /6
B.
L O =11 mL 2 w /4
C.
L O =8 mL 2 w /3
D.
L O =5 mL 2 w /3
【单选题】Who may serve as the person in charge of loading and discharge operations aboard a tanker ________．
A.
A licensed officer who holds a tankerman-PIC endorsement
B.
The pumpman who has a tankerman assistant endorsement
C.
The Master
D.
The bosun
【单选题】The manager promised to have my complaint ______.
A.
looked through
B.
looked into
C.
looked over
D.
looked after
【单选题】图示两均质细杆OA与AB铰接于A，在图示位置时，OA杆绕固定轴O转动的角速度为ω，AB杆相对于OA杆的角速度亦为ω，O、A、B三点位于同一铅直线上。已知OA和AB两杆的质量均为m，它们的长度均为L，则该系统此时对O轴的动量矩大小为G O 为（）
A.
A
B.
B
C.
C
D.
D
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