叉车的主要技术参数有:()、门架倾角、最大行驶速度、最小转弯半径、最小离地间隙和轴距、轮距等。
A、额定起重量
B、载荷中心距
C、最大起升高度
D、自重
参考答案:A, B, C
George returned after the war, only _______ that his wife had left him.
A.to be told
B.telling
C.being told
D.told
下列四种消化液中,不含消化酶的是( )
A.唾液
B.胃液
C.胰液
D.胆汁