第1题: [多项选择]使用电动卷扬机时应注意() A. 钢丝绳应从卷筒下方绕人卷扬机,以保证卷扬机的稳定 B. 卷筒上的钢丝绳不能全部放出,至少保留3~4圈,以保证钢丝绳固定端的牢固 C. 应尽可能保证钢丝绳绕人卷筒的方向在卷简中部与卷筒轴线垂直,以保证卷扬机受力的对称性 D. 卷扬机与最后一个导向轮的最小距离不得小于25倍卷筒长度,以保证当钢丝绳绕到卷筒一端时与中心线的夹角符合规定 E. 卷扬杌与最后一个导向轮的最小距离不得小于40倍卷筒长度,以保证当钢丝绳绕到卷筒一端时与中心线的夹角符合规定 参考答案:A, B, C, E
第23题: [单项选择]在Visual FoxPro中,要把某复选框设置成不确定状态,下列的说法正确的是______。 A. 只能给它的Value属性赋值2 B. 只能给它的Value属性赋值.NULL. C. 可以给它的Value属性赋值2或.NULL. D. 可以给它的Enabled属性赋值.F. 参考答案:C 答案解析:[分析] 复选框的Value属性值的设置有3种情况:0或.F.表示复选框未被选中;1或.T.表示复选框被选中;2或.NULL.表示不确定(复选框变灰)。该值只能在代码中设置。
第35题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. She had to work throughout her honeymoon. B. She had nothing to do during her honeymoon. C. She couldn’t go shopping in her honeymoon. D. She spent her honeymoon all by herself. 参考答案:D 答案解析:[听力原文] M: After Kathy came back from her honeymoon, she has been upset these days. Do you know th