弹簧在外力作用下,产生的弹性变形的大小或弹性位移量,称为弹簧的()。
A、挠度
B、弹性
C、塑性
D、柔度
参考答案:A
根据句意填入适当的单词
1. -How _____ is Wang Nan?
-She is twenty-six.
2. Mary was born on September 16th. So that day is her _____.
3. -_____ is his school trip?
-It's March 2nd.
4. May is the fifth _____ of a year.
5. _____ 1st is Children's Day(儿童节).
女婴,1岁半,因头颅大,未出牙,前囟未闭来院门诊。生后人工喂养,间断服用钙剂和维生素D,用量不详。体检:精神可,易哭,体重11kg,前囟2cm×2cm,方颅,头围48cm,胸部有肋骨串珠,心肺(-),双腕部呈手镯状,X线长骨示:骨骺软骨带明显增宽,干骺端呈杯口状,毛刷样改变。该患儿诊断应为
A.软骨营养不良
B.脑积水
C.克汀病
D.佝偻病激期
E.佝偻病恢复期