下列有关橡皮工具描述正确的是：（）A.橡皮工具只能删除开放路径 B.橡皮工具只能删

1988年各地区全民所有制单位劳动保险费用表 单位：万元

下面哪项叙述是正确的（）

A．辽宁劳保费用总额最高

B．天津劳保费用总额最低

C．吉林医疗卫生费最少

D．山西丧葬抚恤费最少

在三相四线制的交流电路中，中性线不允许断开的原因是（）

A、如果中线断开，这时线电压虽然对称，但各相负载不平衡导致中性点位移

B、如果中线断开，使各相负载所承受的电压不再对称

C、如果中线断开，使负载不能正常工作

D、如果中线断开，使负载不能正常工作，甚至损坏设备

Optimism is the art of always seeing the glass half full (1) half empty, finding something positive in even the most (2) of situations and last but not least the ability to expect the best even if the chances are (3) . It enables you to try new things, deal with failure as a learning experience (4) a stopping point. In general optimism gives you a reason to live. The world would be a better place if it was full of optimism, (5) unfortunately the trend in today’s youth is (6) the opposite way. Today it is (7) to be pessimistic. One could spend hours discussing how we arrived at this point, (8) our youth refuses to smell the roses and instead prefers to (9) themselves on their own pessimistic (10) .

Optimism is not an (11) gift but rather a learned behavior (12) . Like most behaviors optimism is best learned by watching examples, (13) you. The first step in creating a generation of people with a positive outlook on life, is to (14) life on the bright side yourself. (15) it would be wrong to (16) your child from all negativity, it is important that you are not the (17) of doubts and worries. Finding something positive in a negative situation needs to be (18) Show how to make the best of things by always (19) the positive, by encouraging your child after a(n) (20) and by explaining over and over that failure is just a part of progress.

4（）

A.via

B.versus

C.over

D.beyond

经批准的规划需要修改时，必须按照规划编制程序经什么部门批准？