硅整流二极管的（）和（）分别是它们的两个电极，可分为（）管子和（）管子。
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吡啶碱在水中的溶解度随温度增高而（）。
A. 不变
B. 减少
C. 增大
D. 无法确定
A towline should be fastened to（）.
A. the chocks at the bow of a towed vessel
B. the most forward，centermost point of a towed vessel such as a sturdy bow rail
C. the mast of a towed sailboat
D. a secure fitting near the bow of the towed vessel
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