角膜的横径是________mm至________mm。
参考答案:11 12
The moment we heard the news of the earthquake, we began to ________ the work to rescue those who were trapped in the building.
A.set off
B.set down
C.set aside
D.set about
哪些酶缺陷可导致苯丙酮尿症()
A.二氢生物蝶呤还原酶
B.鸟苷三磷酸环化水合酶
C.苯丙氨酸羟化酶
D.酪氨酸酶
E.碱性磷酸酶