钩端螺旋体病患者,什么时候在外周血中可找到钩端螺旋体()
A.发病第一周内
B.发病第四周内
C.发病第三周内
D.发病第二周内
E.发病第五周内
参考答案:A
以马克思主义作为指导思想的文字理论,应当具有()的品格。
A.阶级性
B.革命性
C.实践性
D.目的性
In restricted visibility, a vessel which detects by radar alone the presence of another vessel shall determine if a close quarters situation is developing or risk of collision exists. If so, she shall().
A.sound the danger signal
B.when taking action, make only course changes
C.avoid altering course toward a vessel abaft the beam
D.All of the above