题型:单项选择题 关于表皮下列叙述错误的是()A.表皮属于单层柱状上皮 B.表皮主要由角质形成细胞和树枝状细胞两大细胞组成 C.角质形成细胞用苏木精-伊红染色即可着色 D.树枝状细胞无细胞间桥 E.树枝状细胞包括黑素细胞、朗格汉斯细胞和Merkel细胞 查看答案
题型:单项选择题 A marker pole,with a horseshoe buoy and a sea anchor attached,should be used to().A.mark the position of a lost mooringB.determine your vessel's sideslip underwayC.determine your speed through the waterD.indicate location of a man overboard 查看答案