When standing on a ship and facing the bow, the left-hand side is called ______.
A. the left side
B. the port side
C. the starboard side
火车运动时,其轮轴横截面边缘上危险点的应力有四种说法,正确的是()。
A. 脉动循环应力
B. 非对称的循环应力
C. 不变的弯曲应力
D. 对称循环应力
We should apply for annual spare parts according to____Ithe need of annual overhaul IIthe
A. I
B. II
C. I + II
D. III
以三带喙库蚊为传播媒介的病奉是
A. 麻疹病毒
B. 冠状病毒
C. 轮状病毒
D. 合胞病毒
E. 流行性乙型脑炎病毒