下列说法正确的是: [ ]
A.比热容大的物体,吸热一定多
B.比热容大的物体,具有的内能一定大
C.物体的温度升高,比热容就变大
D.每种物质都有自己的比热容
答案:D
34.About seven years ago she felt she had to ask herself____she really wanted to spend her life farming. Now she has make up her mind to quit farming.
A.when
B.whether
C.what
D.where
恶性肿瘤是一种严重威胁人类健康的常见病和多发病,人类因恶性肿瘤而引起的死亡率居所有疾病死亡率的第2位,仅次于心脑血管疾病。
具有亚硝基脲结构的是()
A.美法仑
B.巯嘌呤
C.塞替派
D.卡莫司汀
E.异环磷酰胺