题目内容

Inventory carrying costs () a number of different factors or elements, and the importance of these factors can vary from product to product.

A. consist in
B. consist of
C. including
D. compose

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There are certain goods which are demanded seasonally, like down jacket in winters or raincoat in the () season.

A. snowy
B. windy
C. rainy
D. foggy

透镜式色灯信号机的额定电压是（）。

AC12V
B. AC30V
C. DC12V
DC30V

透镜式色灯信号机灯泡，采用铁路信号专用的（）灯丝。

调车信号机选用一个（）机构。