题目内容

假设类 ClassB是 ClassA的子类，其中 ClassA 的属性和方法如图所示，则 ClassB能够访问的有哪些？

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在绘制类图时，第一步就是发现类，最常用的方法是什么？请简要说明它的使用方法。

The ﬁrst internal-combustion engine to operate successfully on the four-stroke cycle used gas as the energy source and was built in ____ by Nicolaus August Otto, a self-taught German engineer at the Deutz factory near Cologne.

A. 1876
B. 1877
C. 1878
D. 1879

The main components of an engine are ___, _, _, ___ and valves.

A. cylinder block
B. pistons
C. connecting rods
D. crankshaft

Today’s automotive engines can be classified in several ways depending on the following design features:__, _, and __.

A. Operational cycles
B. Number of cylinders
Cylinder arrangement
D. Valvetrain type