A:先注射胰岛素溶液,后注射葡萄糖溶液
B:先注射葡萄糖溶液,后注射胰岛素溶液
C:先注射胰岛素溶液,后注射生理盐水
D:先注射生理盐水,后注射胰岛素溶液
阅读下面一首明诗,回答问题。
东园雨坐书怀
刘崧
鸟自鸣春花自开,离人去住总兴哀。荒村道路兼泥潦,故里田庐半草莱。
万姓疮痍谁复问,群雄爪角自相摧。东南竟日愁昏黑,消息虚传首屡回。
【注】刘崧(1321﹣1381),字子高,泰和人。生活于元末明初的战乱年代,元末举于乡。洪武三年以人才荐,授职方郎中,迁北平按察司副使。
This Sunday is grandpa's birthday. The Smith family are going to celebrate it at home, so they will have a busy weekend.
Saturday
Morning
Dad-clean the car in the garden
Mum-clean the kitchen and bedrooms of their house
Amy-have dance lessons in the gym
Rose--work on science projects in the library
Afternoon
Mum and Dad-buy some food at the supermarket
Amy and Rose-choose gifts and cards for grandpa
Evening
Watch TV together
Sunday
Mum---make a big birthday cake
Amy and Rose-wrap grandpa's gifts
Amy-help Mum cook delicious food
Rose-help Dad decorate the sitting room
Amy and Rose-give gifts to grandpa
The whole family-have a party
根据表格所提供信息,从每小题所给的A、B、C三个选项中,选出一个最佳答案。
(1)已知函数f(x)=|x﹣1|+|x+3|,求x的取值范围,使f(x)为常函数;
(2)若x,y,z∈R,x2+y2+z2=1,求m=2x+2y+5z的最大值.