如图所示,MN为主光轴,F为焦点,根据光线经过透镜前、后的方向,画出透镜中心的位

题型:操作题

问题:

如图所示,MN为主光轴,F为焦点,根据光线经过透镜前、后的方向,画出透镜中心的位置,并标出O透镜的种类:

考点:凸透镜对光的作用焦点,焦距凹透镜对光的作用
题型:操作题

药典中山楂薄层色谱法试验中的对照品为()

A.槲皮素

B.金丝桃苷

C.表儿茶精

D.绿原酸

E.熊果酸

题型:操作题

“I don’t believe in Santa Claus!” Trogmire announced.

Tremor looked shocked. “Why not?” he asked.

“Because he never leaves me any gifts at all,” Trogmire growled.

Tremor thought about the evidence for a few seconds. “Maybe,” he suggested, “it’s because when Santa checked his list, your name wasn’t in the ‘nice’ column.”

“So, he could at least bring me a lump of coal!” Trogmire replied. “And,” he went on, “Troubled doesn’t believe in Santa, either.”

“Right,” Tremor said, “because he saw his parents putting the ‘From Santa’ presents under the tree. But I know the truth about that. My mother found out from Troubled’s mother. When Troubled’s parents got an e-mail from Santa, saying that he would never bring Troubled another gift, they didn’t want to tell him the truth. So now they buy presents and pretend they’re from Santa.”

“What did Troubled do to get Santa so mad?” Trogmire questioned.

“I think it had something to do with the time he put glue paper all over the living room floor on Christmas Eve, and left a sign that said, ‘Trapped like a rat!’ hanging over the fireplace.” said Tremor.

“I guess Santa doesn’t have a sense of humour,” sighed Trogmire. “Well, at least I’m not the only one who Santa scratched off his name list.”

小题1:Why doesn’t Santa leave presents for Trogmire or Troubled?

A.Their parents won’t let him leave gifts.

B.He can’t find their homes.

C.He often forgets their names.

D.They have behaved badly.小题2:Trogmire and Troubled don’t believe in Santa because ________.

A.Santa has no sense of humor

B.Santa doesn’t give them anything

C.they are too naughty to believe

D.Tremor convinced them he wasn’t real小题3:Troubled’s parents never ________.

A.told him about the message from Santa

B.loved him very much

C.cared about how he behaved

D.bought him anything小题4:Trogmire’s last comment could be an example of the saying _______.

A.Misery(苦难,不幸) loves company

B.Easy come, easy go

C.Beauty is only skin deep

D.Love me, love my dog

题型:操作题

谁的发明表达了夫妻之间的关心和恩爱?( )

A.李维利亚

B.汉娜蒙塔基

C.皮埃尔卡尔梅

D.布莱泽帕斯卡

题型:操作题

软组织化脓感染中有接触性传染的是()

A.疖

B.痈

C.丹毒

D.蜂窝织炎

E.急性淋巴结炎

题型:操作题

以下哪项不宜火煅()

A.代赭石、石膏

B.朱砂、琥珀

C.石决明、珍珠母

D.磁石、礞石

E.牡蛎、龙骨

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