L壳层最多可容纳的电子数是()
A.2个
B.4个
C.8个
D.12个
E.18个
参考答案:C
你能找出下列句子中的错误吗?选出来并改一改。
( ) 1. We got back to Beijing by train in January 1st. _________________
A B C
( ) 2. Am I come in? _________________
( ) 3. They are visitor to this city. _________________
( ) 4. How is Mike feel? _________________
( ) 5. Did you helped them clean their room? _________________
关于卵巢浆液性囊腺癌,描述错误的是()。
A.儿童及青少年最常见的卵巢恶性肿瘤
B.肿瘤生长快,常伴出血坏死
C.多为部分囊性,部分实性
D.彩色多普勒血流显像, * * 内显示较丰富血流
E.约1/2为双侧性